In the documents, two undercover police officers were on the scene minutes before the shooting started, but left to follow other bikers.

Police said they often work to keep an eye on things because of ongoing issues between biker clubs. They said the surveillance was not based on any inside information that anything was going to go down.

Four members of a splinter group from the Warlocks are in jail and accused of ambushing the other three men, killing them in the parking lot. The four men said they fired in self-defense.